Kardashian’s weight loss secrets were cardio exercise and a low-carb Atkins diet that limited her daily carb intake to less than 40 grams, TheImproper reported.

In 2014, Kim lost 56 pounds in 6 months with a low-carb Atkins diet that limited her daily carb intake to less than 60 grams. This time, Kardashian is consuming just 20 to 40 net grams of carbs a day, as Celebrity Health Fitness has reported.

Low carb, high-fat diets like the Atkins and ketogenic diets promote rapid weight loss by inducing the body to burn fat for fuel, said obesity expert Dr. Eric Westman, author of New Atkins For a New You.